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Finding the Fourth Proportional to 912.15, 1,257.99 and 771.05

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Solution

The fourth proportional to 912.15, 1,257.99 and 771.05 is: 1,063.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.15 : 1,257.99 = 771.05 : x
  2. Step 2: Convert to fraction form
    912.15/1,257.99 = 771.05/x
  3. Step 3: Cross multiply
    912.15x = 1,257.99 × 771.05
  4. Step 4: Simplify right side
    912.15x = 969,973.19
  5. Step 5: Solve for x
    x = 969,973.19/912.15
  6. Step 6: Final answer
    x = 1,063.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.